Hay Fish,
Sorry for the delay in responding to you, I had to work this week end, I don't know what version of Silent Hunter 4 Wolves of the Pacific, that you are running, 1.4 or (1.5 which includes the u-boat missions), which i encourage you to get. It improves the game and there seem to be a lot more mods for it (1.5). But I think you should have only one, Depth charges exploding from submarine wave file in you sound folder. Having 2 may cause a conflict (CTD) The click is very pronounced and you should have no trouble hearing it. Save the original Depth charges exploding from submarine wave file to somewhere safe, as a back up, in case you don't like the modded one, and just drop the modded one in your sound folder. That's it.... Hope this helps, Indy